c0dee90348
Contributed to pkgsrc-wip by Jason Bacon.
ARPACK is a collection of Fortran77 subroutines designed to solve large
scale eigenvalue problems.
The package is designed to compute a few eigenvalues and corresponding
eigenvectors of a general n by n matrix A. It is most appropriate for large
sparse or structured matrices A where structured means that a matrix-vector
product w <- Av requires order n rather than the usual order n**2 floating
point operations. This software is based upon an algorithmic variant of the
Arnoldi process called the Implicitly Restarted Arnoldi Method (IRAM). When
the matrix A is symmetric it reduces to a variant of the Lanczos process
called the Implicitly Restarted Lanczos Method (IRLM). These variants may be
viewed as a synthesis of the Arnoldi/Lanczos process with the Implicitly
Shifted QR technique that is suitable for large scale problems. For many
standard problems, a matrix factorization is not required. Only the action
of the matrix on a vector is needed. ARPACK software is capable of solving
large scale symmetric, nonsymmetric, and generalized eigenproblems from
significant application areas. The software is designed to compute a few (k)
eigenvalues with user specified features such as those of largest real part
or largest magnitude. Storage requirements are on the order of n*k locations.
No auxiliary storage is required. A set of Schur basis vectors for the desired
k-dimensional eigen-space is computed which is numerically orthogonal to working
precision. Numerically accurate eigenvectors are available on request.
Important Features:
o Reverse Communication Interface.
o Single and Double Precision Real Arithmetic Versions for Symmetric,
Non-symmetric, Standard or Generalized Problems.
o Single and Double Precision Complex Arithmetic Versions for Standard
or Generalized Problems.
o Routines for Banded Matrices - Standard or Generalized Problems.
o Routines for The Singular Value Decomposition.
o Example driver routines that may be used as templates to implement
numerous Shift-Invert strategies for all problem types, data types
and precision.
10 lines
532 B
Text
10 lines
532 B
Text
$NetBSD: distinfo,v 1.1.1.1 2012/05/29 16:38:01 asau Exp $
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SHA1 (arpack96.tar.gz) = 3f91de2b39b484bc8365f8048c9eb109e0306e1c
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RMD160 (arpack96.tar.gz) = 3d1c1c307223961506066f895b7ab291861e73fe
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Size (arpack96.tar.gz) = 636865 bytes
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SHA1 (patch.tar.gz) = 9fc6db4180d516d834d959a5f079e63f174f98fa
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RMD160 (patch.tar.gz) = 4ccda2de8dc04c9ecb0ea722f230f5dd5c981154
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Size (patch.tar.gz) = 226473 bytes
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SHA1 (patch-ARmake.inc) = f3e11d5ef8f11c8c253a487baec5e0b18aa07a8c
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SHA1 (patch-UTIL_second.f) = 6a9d03f815b6d73669e637f5bfae6e8d38df90fd
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